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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H3><A NAME="HDRDXGECV"
HREF="progu097.htm#PToC_262">DXGetEnumeratedComponentValue</A></H3>
<A NAME="IDX1723"></A>
<A NAME="IDX1724"></A>
<P><STRONG>Function</STRONG>
<P>
Provides access to the components of a Field by index rather
than by name.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
&#35;include &lt;dx/dx.h&gt;<BR>
<P><BR>
Object DXGetEnumeratedComponentValue(Field f, int n, char **name)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
Provides access to all components
of the Field
<TT><STRONG>f</STRONG></TT> without requiring a list of component names.  We
might, for example, find all components that are dependent on
positions by using
<TT><STRONG>DXGetEnumeratedComponentValue</STRONG></TT> in a looping construct
in which
<TT><STRONG>DXGetEnumeratedComponentAttribute</STRONG></TT>
(or, using the name returned by
<TT><STRONG>DXGetEnumeratedComponentValue</STRONG></TT>, using
<TT><STRONG>DXGetComponentAttribute</STRONG></TT>) is used to access the
"dep" attribute of each component.
<P>
The components of Field
<TT><STRONG>
f
</STRONG></TT>
may be indexed by calling
<TT><STRONG>
DXGetEnumeratedComponentValue
</STRONG></TT>
with successive values of
<TT><STRONG>
n
</STRONG></TT>
until
<TT><STRONG>
NULL
</STRONG></TT>
is returned.  The name of the component is returned in
<TT><STRONG>*name</STRONG></TT>.
<TABLE><TR><TD ALIGN="LEFT" VALIGN="TOP"><B>Note:</B></TD><TD ALIGN="LEFT"
VALIGN="TOP">
<TT><STRONG>DXGetEnumeratedComponentAttribute</STRONG></TT>
would not be suitable for use in the looping construct because it will
return
<TT><STRONG>
NULL
</STRONG></TT>
if the
<TT><STRONG>n</STRONG></TT>th component doesn't have the specified component,
even if there are more than
<TT><STRONG>n</STRONG></TT> components.
</td></tr></table>
<P><STRONG>Return Value</STRONG>
<P>
Returns the value of the component or returns <TT><STRONG>NULL</STRONG></TT>
but does not set an error code if <TT><STRONG>n</STRONG></TT> is out
of range.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu162.htm#HDRDXGCA">DXGetComponentAttribute</A>,
<A HREF="progu163.htm#HDRDXGCV">DXGetComponentValue</A>,
<A HREF="progu167.htm#HDRDXGECA">DXGetEnumeratedComponentAttribute</A>
</STRONG></TT>
<P>
<A HREF="progu044.htm#HDRFIELDSC">12.1 , "Field Class"</A>.
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